JPH02102753A - Cleaning method for electrostatic precipitator - Google Patents

Abstract

PURPOSE:To enhance cleaning operation efficiency of an electrostatic precipitator and to lower concn. of dust in an outlet by repeating load and unload for a discharge pole at plural times in such a state that the outlet or both an inlet and the outlet of the gas passage of a dust collection chamber are closed and generating ionic wind in the dust collection chamber. CONSTITUTION:Ionic wind is generated in a dust collection chamber 12A by repeating lead and unload for a discharge pole 14 at plural times in such a state an outlet 38 or both an inlet 36 and the outlet 38 of the gas passage of a dust collection chamber 12A are closed. In other word, dust stuck and deposited on the inner wall surface, etc., of the dust collection chamber can be allowed to fly and fall by continuously generating ionic wind during cleaning operation of the electrostatic precipitator. Thereby cleaning operation efficiency is enhanced and the concn. of dust in the outlet can be lowered.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for cleaning an electrostatic precipitator, and in particular, to efficiently remove dust in a dust collection chamber during a cleaning operation using a hammering device of an electrostatic precipitator. This invention relates to a method for cleaning an electrostatic precipitator that is well cleaned.

[Conventional technology]

In an electrostatic precipitator, there is a dust collection chamber composed of a discharge electrode, a dust collection electrode, a hammering device, etc., an insulator chamber in which a support insulator for supporting the discharge electrode is stored, and a an insulator seal fan provided to prevent gas from entering the chamber; a discharge device provided to transport collected dust collected in the dust collection chamber to the outside of the electrostatic precipitator; It consists of a DC high voltage generator that charges a discharge electrode via a supporting insulator.

The operation pattern of each device during normal operation of a conventional electrostatic precipitator equipped with a hammering device is shown in FIG. 4, and according to this, the gas outlet damper is always open. Furthermore, the insulator seal fan, DC high pressure generator, discharge hammer device, and discharge device are continuously operated. The dust collecting pole hammering device is operated so that a down time T1 and an operating time T2 are alternately repeated a plurality of times.

FIG. 5 shows the operation pattern of each device during the cleaning operation of a conventional electrostatic precipitator, in which the gas outlet damper is always closed. The discharge electrode hammering device and the dust collecting pole hammering device are operated continuously for an operating time T3. The insulator seal fan and evacuation device are operated continuously for an operating time T and a subsequent delay time T1.

Since the DC high pressure generator is stopped at that time, the electrostatic precipitator is in an uncharged state during the cleaning operation. The cleaning method inside the electrostatic precipitator is such that a discharge electrode hammering device and a dust collection pole hammering device hammer the discharge electrode and the dust collection pole, respectively.
The dust adhering to the discharge electrode and dust collecting electrode is scattered and dropped, and the discharge device carries it out of the electrostatic precipitator to clean the inside of the electrostatic precipitator.

[Problem that the invention seeks to solve]

However, during the cleaning operation of a conventional electrostatic precipitator,
Dust that has adhered to or accumulated on the dust collection electrode or discharge electrode can be hit with a hammer using a hammering device to cause it to scatter and fall, but it is not possible to cause the dust that has adhered or accumulated to the inner wall of the dust collection chamber to scatter and fall. The dust adhering to and accumulating on the inner walls of the dust collecting chamber is scattered and fallen by the influence of the ionic wind caused by the blow-up when the gas blow suddenly changes and the sudden increase in the output current during re-discharge. This scattered and fallen dust scatters to the gas outlet of the electrostatic precipitator and is discharged from the gas outlet when normal operation is restarted, which may increase the outlet dust concentration.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for cleaning an electrostatic precipitator that increases the cleaning operation efficiency of the electrostatic precipitator and lowers the outlet dust concentration.

[Means for solving problems]

In order to achieve the above object, the present invention generates an ionic wind inside the dust collection chamber by repeatedly charging and stopping charging the discharge electrode with only the outlet or the entrance of the gas passage of the dust collection chamber closed. Features.

[Effect]

According to the present invention, first, the outlet or entrance of the gas passage of the dust collection chamber is closed. The insulator seal fan is operated continuously to prevent gas from entering the insulator room from the dust collection room.

The discharge electrode hammering device, the dust collection pole hammering device, and the discharge device are operated continuously to scatter and fall the dust adhering to the discharge electrode and the dust collection electrode, and the dust is carried out of the electrostatic precipitator by the discharge device.

Furthermore, the DC high pressure generator is configured to repeat activation and deactivation multiple times. At this time, the current generated from the DC high voltage generator is set to maximum output. When the DC high-pressure generator is activated to generate charge on the discharge electrode, an ion wind is generated in the dust collection chamber due to the instantaneous charge. The ion wind can be obtained multiple times by alternately repeating the activation and stopping of the DC high pressure generator multiple times. Due to the ion wind, dust that cannot be scattered and fallen by simply hammering the discharge electrode and dust collecting electrode with a hammering device, dust that has adhered to or accumulated on the inner wall surface of the dust collection chamber, etc., and the hammering device can hammer the dust. The scattered and fallen dust newly adheres to the inner wall surface of the dust collecting chamber, and the accumulated dust is scattered and fallen during the cleaning operation, and is carried out by the discharge device.

〔Example〕

Preferred embodiments of the method for cleaning an electrostatic precipitator according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 shows an embodiment of the electrostatic precipitator according to the present invention, and FIGS. 3(A) and 3(B) respectively show a dust collecting electrode and a hammering device of the electrostatic precipitator according to the present invention. An explanatory diagram of the interior of the insulator chamber and an explanatory diagram of the inside of the insulator chamber are shown. A dust collection chamber [2A] constituted by the discharge electrode 14, the dust collection electrode 16, the discharge electrode hammering device 24, and the dust collection pole hammering device 26, and an insulator in which a support insulator 31 for supporting the discharge electrode 14 is housed. chamber 32, an insulator seal fan 33 provided to prevent gas from entering the insulator chamber 32 from the dust collection chamber 12A, and an electrostatic precipitator to collect dust collected in the dust collection chamber. Discharge bag provided for transporting outside! 3.0. , a DC high voltage generator 34 connected to the discharge electrode 14 via a supporting insulator, and an electric collector I! ! The device is configured.

FIG. 1 shows the operation pattern of each device during cleaning operation of the electrostatic precipitator according to the present invention, in which the outlet damper 38 provided at the gas inlet and outlet or the inlet/outlet damper 36,38 is closed, and the gas passage is closed. I'm being treated like that. Discharge hammer device 2
4 and the dust collecting pole hammering device 26 are continuously operated for an operating time T. The insulator seal fan 33 and the discharge device 30 are
It is continuously operated for the operation time T3 and the subsequent delay time T. Furthermore, the DC high pressure generator 34 has an operating time T
After 3, the stop time T@ is repeated multiple times alternately. At this time, the current generated from the DC high voltage generator 34 is set to the maximum output.

Next, the operation of the cleaning method for the electrostatic precipitator configured as described above will be explained.

First, the discharge electrode hammering device 24 and the dust collection pole hammering device 26 hammer the discharge electrode 14 and the dust collection pole 16, respectively.
The dust adhering to the discharge electrode 14 and the dust collection electrode 16 is scattered and fallen, and the scattered and fallen dust is carried out of the electrostatic precipitator 10 by the discharge device 30, and the electrostatic precipitator 1tlo is cleaned. Furthermore, when the DC high pressure generator 34 is operated to generate charge on the discharge electrode, an ion wind is generated in the dust collection chamber due to the instantaneous charge. Ion wind is obtained multiple times by repeating the operation and stopping of the DC high pressure generator 34 multiple times. The ionic wind removes dust that would not be scattered and fallen by simply hammering the discharge electrode 14 and dust collection electrode 16 with a hammer, dust that has adhered to and accumulated on the inner wall surface 12B of the dust collection chamber 12A, and the hammering device. The dust scattered and fallen by hammering newly adheres to the inner wall surface 12B of the dust collection chamber 12A, etc., and the accumulated dust is scattered and fallen during the cleaning operation, and is carried out of the electrostatic precipitator 10 by the discharge device 30. can do. Therefore, the dust that has adhered to and accumulated on the inner wall surface 12B of the dust collecting chamber 12A during the cleaning operation can be scattered and fallen.

〔Effect of the invention〕

As explained above, according to the method for cleaning an electrostatic precipitator according to the present invention, by continuously generating ionized wind during the cleaning operation of the electrostatic precipitator, the inner wall surface of the dust collection chamber of the electrostatic precipitator is cleaned. The attached and accumulated dust can be scattered and fallen, thereby increasing the efficiency of cleaning operation and lowering the degree of IJ.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a cleaning operation pattern of a method for cleaning an electrostatic precipitator according to the present invention, and FIG. 2 is an explanatory diagram showing an example of a cleaning operation pattern of a method for cleaning an electrostatic precipitator according to the present invention. A perspective view including a partial cross section, Figures 3 (A) and (B) are explanatory views of the dust collection pole and hammering device, explanatory views of the insulator seal fan, Figures 4 and 5.
The figure shows a conventional example of electrical industry f! ! They are an explanatory diagram showing an example of a normal operation pattern of the device, and an explanatory diagram showing an example of a cleaning operation pattern. 1O...electrostatic precipitator, 12A...dust collection chamber,
14... Discharge electrode, 16... Dust collection electrode, 34...
DC high pressure generator. Figure 2] Applicant Hitachi Plant Construction Co., Ltd. Figure (A) (B) Figure 5 Figure Time-111

Claims (1)

[Claims] (1) Cleaning of an electrostatic precipitator characterized by repeatedly charging and stopping charging a discharge electrode multiple times with the exit or entrance of the gas passage in the dust collection chamber closed, thereby generating ionic wind inside the dust collection chamber. Method.